Identity politics is all the rage among the bottom dwellers, so let’s drill down on the two brothers who bombed the Boston Marathon and brought the city to a standstill.

One was a white Muslim Russian boxer who didn’t like to remove his shirt, lest girls get “bad ideas.” The other is a teenage collegian gym rat who smoked weed and enjoyed “Game of Thrones” on HBO. Perhaps, after immersing himself in an ancient land of violent kingdoms, stoner Dzhokhar Tsarnaev fancied himself a modern-day dragon slayer.

So I’m not sure what group we should blame, although I trust Rush Limbaugh and Ann Coulter will let us know. But here’s a hint, from a Coulter tweet:

“It’s too bad Suspect # 1 won’t be able to be legalized by Marco Rubio, now,” wrote Coulter. Violence involving foreigners is always tied to the purported evils of immigration reform, even if Coulter ignores the fact that both men were in this country legally.

Then there’s this, from Arkansas lawmaker Nate Bell:

“I wonder how many Boston liberals spent the night cowering in their homes wishing they had an AR-15 with a hi-capacity magazine?” I’m guessing the Boston liberals spent the night feeling grateful for the weapon-wielding professionals.

As we learn more about the brothers who sparked one of the most extraordinary weeks in Boston history, we may never know what mix of madness, alienation and distortion of Islam caused them to murder and maim innocent strangers. They didn’t appear to be backed by a sophisticated terror network; rather, these guys seem more like the disaffected teens who shot up fellow students at Columbine, not organized jihadists bent on destroying America. Even though he had been in this country more than five years, 26-year-old Tamerlan Tsarnaev indicated that he was isolated and adrift.

“I don’t have a single American friend,” he once wrote. “I don’t understand them.”

Worcester boxing champ Edwin Rodriguez, who sparred with Tamerlan Tsarnaev more than a year ago, recalls that Tsarnaev came to Worcester alone for the bout.

“It was odd,” Rodriguez recalled. “He seemed like a loner. Most guys come with a trainer or friends or someone they have in their corner.”

Of course, this “loner” theory enrages Limbaugh, who never met a tragedy he couldn’t tar with hate-mongering partisanship. Even before police had identified the suspects, Limbaugh was ranting about Bill Ayers and his association with President Barack Obama, because nonsensical resentment makes perfect sense during a crisis.

“If it turns out that a Muslim bombed the Boston Marathon, everyone in the media will circle the wagons and say, ‘This is not because of Islam. This is a lone bad actor, lone wolf,’ ” Limbaugh said. “However, if it turns out that whoever did this has either a real or imagined connection to conservatism, everyone in the media will unite to denounce the whole group. What if the terrorist happens to be an acolyte of Bill Ayers?”

Oh, Rush. Please, shut up. How about we focus on the people who committed these atrocities, and the tremendous job of law enforcement in apprehending them?

Other than the odious motives of the bottom dwellers, it’s human nature to seek explanations in the wake of such anguish. We need to know why men conspire to blow up their neighbors.

But answers don’t always equal understanding and sometimes things make no sense. Four days before unleashing mayhem, Dzhokhar Tsarnaev tweeted friends with the abandon and banality of a typical 19-year-old.

“Dreams really do come true,” he wrote. “Last night I dreamt I was eating a cheeseburger and in the afternoon today, guess what I was eating.”

We’d like to believe that we recognize evil, so we can prevent it. We can’t. And demagoguery does nothing but appeal to our fears and basest instincts.

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